Scr8pe, as far as I'm aware these types of post are banned, and the forum admin are usually pretty darn good at getting rid of them. Preventing them popping up in the first place is a pretty hard thing to police though i'd imagine.
Sadly as you say, by repeatedly posting quoting the original spam post, you won't be doing anything more than drawing further attention advertising
I think the best thing to do is simply ignore them (annoying as they are), they don't happen too often, and as mentioned earlier, the admin are fairly swift in getting rid of them.